Performance Improvement of Pentacene Organic Thin Film Transistor by Inserting 1,1'-Bis(di-4-tolylaminophenyl) Cyclohexane Hole Transport Buffer Layer

Organic thin film transistors (OTFTs) were fabricated by inserting various thickness of 1,1'-bis(di-4-tolylaminophenyl) cyclohexane (TAPC) hole transport layer (HTL) between pentacene and source/drain electrodes. Compared to the OTFTs without a HTL, these devices with optimum thickness TAPC HTL not only showed a decrease of threshold voltage (VT) but also presented an enhancement of charge carrier mobility. The performance enhancement of OTFTs was ascribed to an increase of bulk hole transport properties in continuous film of HTL, which was analyzed by the variation trend of total resistance and contact resistance at metal–organic interface.

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